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REVIEW 3 major objections 5 minor 1 cited by

Street Gaussians without 3D Object Tracker

T0 review · 3 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash

Pith's one-line read Street scenes reconstruct without 3D object trackers.

desk verdict A solid empirical extension of Street Gaussians/S3Gaussian that replaces 3D trackers with a 2D foundation model plus LiDAR/ICP and a scheduled motion loss, with strong Waymo-NOTR results but an under-tested claim of autonomous error correction. read the letter →

arxiv 2412.05548 v4 pith:LJAXGOAY submitted 2024-12-07 cs.CV

classification cs.CV
keywords streetscenereconstruction3DGaussianSplatting2DobjecttrackingLiDARpointcloudHexPlanemotionlearningnovelviewsynthesisautonomousdriving
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper aims to show that dynamic street-scene reconstruction does not need 3D object trackers or ground-truth object poses. It builds vehicle trajectories by projecting 2D segmentation masks from a general-purpose 2D tracker onto LiDAR points and aligning the partial clouds frame-by-frame with ICP into a canonical model. Those trajectories supervise a HexPlane-based motion field only during early training; afterwards the field is free to correct pose errors and interpolate through missed detections. The authors report that this pipeline outperforms existing pose-based and self-supervised methods on Waymo-NOTR and KITTI without any tracking annotations. If correct, it removes the main annotation bottleneck for turning raw driving logs into editable, re-renderable 3D scenes.

What carries the argument

The load-bearing machinery is a two-stage trajectory-to-motion pipeline. First, 2D segmentation masks $M$ from a general-purpose tracker are re-projected onto LiDAR to obtain per-view object clouds $O_t^{(j)}$, and ICP aligns each successive partial cloud to an incrementally built canonical model $O$; overlap thresholds decide whether a frame updates the model (above 30%), is recorded as pose only (10-30%), or is discarded as a failed detection (below 10%). Second, dynamic Gaussians are deformed through a HexPlane feature grid: six learnable planes ($xy$, $xz$, $yz$, $xt$, $yt$, $zt$) encode spatial-temporal features, and decoders predict per-point motion $\Delta X_t$ and color change $\Delta C_t$. The motion loss $\mathcal{L}_{\text{motion}} = \mathrm{avg}_{X \in O} |\Delta X_t - (T_t X - X)|$ supervises the field with the tracker-derived trajectory for the first 40% of iterations, then is removed so the implicit field can smooth over and correct tracker errors. Isotropic Gaussian marbles keep dynamic points simple so all deformation is carried by motion and color, making the learned motion the main carrier of the argument.

What would settle it

Take a Waymo sequence with known vehicle poses, run the pipeline with the 2D tracker's masks, and compare the estimated trajectory $T_t$ against the ground-truth poses frame by frame. The central claim would be falsified if frames accepted by the 30%/10% overlap rule systematically carry translation errors above a few tens of centimeters, or if removing the motion loss after 40% of training fails to improve dynamic-region rendering on occluded frames compared with keeping trajectory supervision throughout.

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Extended reading notes

Core claim

The central claim is that a 3D object tracker is unnecessary for high-quality dynamic street reconstruction. The paper's replacement is a stable object-tracking module that lifts 2D tracks to 3D, plus a motion-learning module that uses those tracks as soft supervision rather than rigid truth. The key move is to treat the trajectory-derived pose $T_t$ as a temporary teacher: the model learns per-point motion $\Delta X_t$ in HexPlane feature space, is pushed toward the teacher for the first 40% of training, and is then free to deviate, which lets it correct pose errors and recover missed detections. The paper reports that on Waymo-NOTR this beats Street Gaussians (3D-tracker-based) and S3Gaussian (self-supervised), and on KITTI it matches pose-supervised Street Gaussians on PSNR while exceeding it on SSIM and LPIPS.

Load-bearing premise

The load-bearing premise is that the 2D segmentation masks and the camera-LiDAR calibration are accurate enough that frame-by-frame ICP builds a clean canonical model of each vehicle; if masks are wrong or calibration is off, the trajectory loss teaches the motion field the wrong motion and the overlap thresholds cannot tell a real tracking failure from a bad alignment.

Editorial extensions

If this is right

  • New street scenes can be reconstructed from raw multi-view video plus LiDAR with no manual object poses and no 3D tracker, needing only a pretrained 2D tracker and sensor calibration.
  • Tracking errors no longer break rendering: frames discarded by the 10% overlap rule simply drop out of trajectory supervision, and the motion field can interpolate through them.
  • Because motion is per-Gaussian rather than a single rigid pose, within-object non-rigid changes such as open doors are representable.
  • Novel views can be rendered at arbitrary timestamps, including frames where the object was never successfully tracked, by querying HexPlane features at the desired time.
  • The method's performance is stable across two different 2D trackers (GLEE and UNINEXT), indicating the pipeline does not hinge on one specific tracker.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Editorial inference: the same 2D-mask-plus-ICP canonicalization could be applied to other dynamic classes such as pedestrians, where per-point deformation would handle articulated motion more naturally than rigid poses.
  • Editorial inference: the 40% supervision-removal schedule suggests a broader principle, that explicit pose priors work best as an initial curriculum for implicit motion fields, which could transfer to other dynamic reconstruction settings.
  • Editorial inference: because the method relies only on 2D tracking and LiDAR, it could in principle reconstruct scenes from any driving dataset with those sensors, even ones with no 3D annotations; the Waymo and KITTI experiments support but do not prove that.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper proposes replacing 3D object trackers in dynamic street-scene Gaussian splatting with a pipeline built on a 2D foundation-model tracker. Vehicles are tracked in 2D with GLEE, lifted to 3D by projecting LiDAR points through segmentation masks, associated across cameras, and accumulated into a canonical point cloud via incremental ICP alignment, which also yields per-frame object poses. These poses are used to supervise per-point deformations predicted by a HexPlane network for the first 40% of training iterations, after which the motion loss is removed and photometric and geometric losses dominate. The method is evaluated on Waymo-NOTR and KITTI for scene reconstruction and novel view synthesis, with ablations targeting the tracking module, the motion loss, the isotropic marble representation, and the choice of 2D tracker.

Significance. The practical motivation is strong: avoiding 3D trackers and ground-truth object poses would broaden the applicability of dynamic street-scene reconstruction, and the use of 2D foundation models is a reasonable route toward better domain generalization. The paper also reports useful ablations, a comparison against rigid-transformation motion modeling, an analysis of tracking error distributions, and explicit failure cases in the supplementary material. If the central robustness claim were quantitatively established, the contribution would be significant. However, the headline claim of outperforming existing methods is not uniformly supported by the KITTI results, and the load-bearing claim that the HexPlane motion learning corrects trajectory errors and recovers missed detections is currently supported only indirectly.

major comments (3)
  1. [Abstract; §4.2, Table 2] The abstract and the contribution list state that the method "outperforms existing approaches" on Waymo-NOTR and KITTI, but Table 2 shows KITTI-75% PSNR 25.49 versus 25.79 for Street Gaussians (GT pose) and KITTI-50% PSNR 25.11 versus 25.52. The method wins on SSIM and LPIPS in both settings but loses on PSNR. Please qualify the claim, for example by saying "competitive on KITTI with improved SSIM/LPIPS" or by providing an aggregate or per-scene analysis that justifies a global superiority statement. As written, the empirical headline is overstated.
  2. [§3.4, Eq. (7); §4.3, Table 3] The central claim that motion learning "autonomously corrects trajectory errors and recovers missed detections" is not directly tested. Ablation B versus H removes the motion loss entirely, causing a 1.04 dB drop in DPSNR; this demonstrates the value of the initial motion prior, but it does not isolate the error-correction effect. Because Lmotion is active for the first 40% of iterations, any systematic error in Tt is imprinted into the HexPlane features before photometric loss can act. Please add a controlled experiment in which the estimated trajectory Tt is corrupted by known translation/rotation noise, or in which synthetic missed-detection gaps of varying length are introduced, and report final DPSNR as a function of the noise level or gap length. Please also report the fraction of frames rejected by the 10% overlap rule and the typical missed-detection statistics on the test scenes. Without such evidence, the "recovers missed detections" statement remains unsupported.
  3. [§3.3, Eq. (4)] The 30%/10% overlap thresholds and the 50-point cross-camera association rule are introduced without sensitivity analysis. A misclassified frame either corrupts the canonical model with a misaligned partial point cloud or discards a useful observation, and since the canonical model provides both the initial Gaussian positions and the trajectory Tt used by Eq. (7), these thresholds directly affect the downstream motion prior. Please report the distribution of τoverlap on the evaluated scenes and a sensitivity study over the threshold values, or otherwise justify these choices with data.
minor comments (5)
  1. [§3.3, Eq. (4)] The notation is ambiguous: after defining Tt = ICP(Ot, O), the overlap is written as O ∩ Tt^{-1}Ot. If Tt aligns Ot to O, the overlap should be O ∩ Tt Ot unless Tt is defined with the opposite convention. Please clarify the transformation direction.
  2. [Table 2] The caption contains a typo: "Street Guassians" should be "Street Gaussians".
  3. [Tables 1–3] No error bars or standard deviations are reported. Since the Waymo-NOTR dynamic32 subset has only 32 scenes, reporting per-scene variance or confidence intervals would strengthen the comparisons.
  4. [§3.5 and Supplementary §12] The depth loss in Eq. (8) is said to compare rendered depth with LiDAR-estimated depth, but the normalization distance d = 80 appears only in the supplementary Eq. (12). Please state this normalization in the main text for reproducibility.
  5. [Figure 2] The overview figure is dense and many labels are hard to read at normal print size. Please enlarge the pipeline labels or split the figure into two panels.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: trajectory is an intermediate supervision signal, and all reported metrics are measured on held-out images against external ground truth.

full rationale

The paper's load-bearing claim is that 2D-tracker + LiDAR + ICP trajectories plus HexPlane motion learning can replace 3D trackers for street-scene reconstruction. Tracing the derivation chain, the trajectory Tt from Eqs. 3-4 is not the final claim; it is an intermediate supervision signal. The motion loss in Eq. 7 encourages DeltaXt ~ TtX - X, but the paper explicitly applies this loss only for the first 40% of iterations and then removes it, allowing photometric and depth losses to refine the motion. All reported metrics (PSNR, SSIM, LPIPS, DPSNR, DSSIM) are computed on held-out time steps against actual images and GT 3D bounding boxes projected to 2D; none of these metrics is defined in terms of the fitted trajectory or the motion-loss target. The ablations in Table 3 also compare variants against these external metrics rather than against the training signal. The self-citations present in the reference list (e.g., the authors' pose-estimation papers) are background related-work citations and are not used to justify the central claim, nor is any uniqueness theorem imported from the authors' prior work. The robustness claim that motion learning 'autonomously corrects trajectory errors and recovers missed detections' is less directly tested than one might wish, since the main text does not include a controlled trajectory-noise or missed-detection-gap experiment and the supplementary only shows clipped error distributions. However, that is an evidence-strength or correctness-risk concern, not circularity: the paper does not define its output in terms of its input, no equation reduces to another by construction, and no fitted parameter is renamed as a prediction. The derivation is therefore self-contained with respect to the external evaluation protocol.

Assumptions & free parameters 5 free parameters · 7 assumptions · 0 invented entities

The central empirical claims rest on hand-chosen thresholds and training schedules, plus strong assumptions about calibration and 2D tracker reliability. No new physical entities are introduced. The most consequential choices are the ICP overlap thresholds and the 40% motion-loss schedule, because they directly control the trajectories that seed the motion field.

free parameters (5)
  • ICP overlap thresholds = 30% update, 10% discard
    Hand-chosen in Sec 3.3; determines which frames are treated as tracking failures and therefore shapes the trajectory entering Lmotion.
  • View association threshold = 50 shared LiDAR points
    Hand-chosen in Sec 3.3; links objects across cameras and is necessary for the 3D fusion.
  • Motion-loss schedule = first 40% of iterations
    Hand-chosen in Sec 3.4; the removal of Lmotion after 40% is the mechanism claimed to correct pose errors, but no sensitivity study is provided.
  • Loss weights in Eq. 8 = lambda_rgb=1, lambda_depth=1, lambda_ssim=0.1, lambda_tv=0.1, lambda_color-reg=0.01, lambda_motion=1
    Hand-chosen weights; no ablation or tuning procedure is reported.
  • Depth normalization distance = 80 meters
    Predefined in supplementary Eq. 12 for the depth loss; clips depth supervision at 80 meters.
assumptions (7)
  • standard math Differentiable 3D Gaussian splatting formulation (Eqs. 1-2)
    Adopted from 3DGS [37] as the rendering backbone; no new derivation is provided.
  • domain assumption Camera-LiDAR extrinsic and intrinsic calibration are correct for reprojection (Eq. 3)
    If calibration is off, segmented point clouds are contaminated; the paper only mentions 'slight misalignment' and outlier removal, without quantifying tolerance.
  • domain assumption GLEE 2D tracker provides sufficiently accurate and temporally consistent instance masks on unseen driving scenes
    Used in Sec 3.3 to seed all 3D trajectories; the paper presents tracking error histograms but no numeric calibration on the test sets.
  • domain assumption ICP converges to the correct relative pose between partial LiDAR point clouds of a vehicle
    Sec 3.3 builds the canonical model and poses T_t by ICP; partial, sparse, and non-rigid vehicle geometry can violate this.
  • ad hoc to paper The 30%/10% overlap rules correctly classify tracking failure vs success
    These thresholds are introduced in Sec 3.3 without validation; they control which frames supervise Lmotion.
  • ad hoc to paper Removing Lmotion after 40% of iterations lets HexPlane correct trajectory errors via photometric loss
    Sec 3.4 states this as the error-correction mechanism, but no direct trajectory-correction measurement is reported.
  • domain assumption Vehicle point clouds are rigid enough for the ICP canonical model, while per-point non-rigid motion is learned later
    Sec 3.3 assumes rigidity for ICP; Sec 3.4 allows non-rigid deformations such as doors opening. The paper does not analyze the interaction or failure mode.

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Cite this review

Pith. "Pith review of Street Gaussians without 3D Object Tracker." pith.science (2026). https://pith.science/paper/LJAXGOAY

@misc{pith2026241205548,
  author       = {Pith},
  title        = {Pith review of: Street Gaussians without 3D Object Tracker},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/LJAXGOAY}},
  note         = {Machine review of arXiv:2412.05548}
}
read the original abstract

Realistic scene reconstruction in driving scenarios poses significant challenges due to fast-moving objects. Most existing methods rely on labor-intensive manual labeling of object poses to reconstruct dynamic objects in canonical space and move them based on these poses during rendering. While some approaches attempt to use 3D object trackers to replace manual annotations, the limited generalization of 3D trackers -- caused by the scarcity of large-scale 3D datasets -- results in inferior reconstructions in real-world settings. In contrast, 2D foundation models demonstrate strong generalization capabilities. To eliminate the reliance on 3D trackers and enhance robustness across diverse environments, we propose a stable object tracking module by leveraging associations from 2D deep trackers within a 3D object fusion strategy. We address inevitable tracking errors by further introducing a motion learning strategy in an implicit feature space that autonomously corrects trajectory errors and recovers missed detections. Experimental results on Waymo-NOTR and KITTI show that our method outperforms existing approaches. Our code will be released on https://lolrudy.github.io/No3DTrackSG/.

Figures

Figures reproduced from arXiv: 2412.05548 by the authors.

Figure 1
Figure 1. Comparison of 3D tracker-based Street Gaussians [ [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Overview of our method. To overcome the limited generalization of 3D object trackers, we introduce a robust object tracking module based on a 2D object tracker [84]. We integrate 2D tracking with LiDAR data to segment the object’s point cloud and incrementally reconstruct the object model in canonical space frame-by-frame. The canonical model is used to estimate object pose Tt and serves as the initialization for Ga… view at source ↗
Figure 3
Figure 3. Qualitative comparison of novel view synthesis on NOTR dataset. Best viewed with zoom. [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: Editing demonstrations on Waymo-NOTR. 3D tracker PSNR↑ SSIM↑ LPIPS↓ DPSNR↑ DSSIM↑ Street Gaussians CasTrack [82, 83] 25.61 0.816 0.163 21.07 0.597 Street Gaussians VoxelNext [11] 26.98 0.838 0.149 24.62 0.742 [PITH_FULL_IMAGE:figures/full_fig_p015_4.png]
Figure 5
Figure 5. Figure 5: Distributions of tracking errors. GT Ours Inaccurate human motion [PITH_FULL_IMAGE:figures/full_fig_p016_5.png]
Figure 6
Figure 6. Figure 6: Failure cases distinguish between static and dynamic elements within a scene. • The proposed method requires per-scene optimization. A promising direction for future work is the development of a feed-forward approach for predicting generalizable 3D Gaussians. 3 [PITH_…

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Forward citations

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    (11) 1 Original Image MoveRemove Substitute Figure 4

    Structural Similarity Loss ( Lssim): This loss evaluates the structural similarity between Irender and Igt: Lssim = 1.0 − SSIM(Irender, Igt). (11) 1 Original Image MoveRemove Substitute Figure 4. Editing demonstrations on Waymo-NOTR. 3D tracker PSNR↑ SSIM↑ LPIPS↓ DPSNR↑ DSSIM↑...

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    Depth loss is calculated only for pix- els with ground truth depth values between 0.01 and 80 meters

    Depth Loss ( Ldepth): This L1 loss computes the differ- ence between the rendered depth map Drender and the ground truth depth map derived from LiDAR data Dgt: Ldepth = 1 d ||Drender − Dgt||1, (12) where d = 80 is the predefined maximum depth used for normalization. Depth loss...

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    Total Variation Loss (Ltv): A grid-based total variation loss is employed to encourage smooth gradients for Hex- Plane feature grids, following K-Planes [70]: Ltv = avgc,i,j ||P i,j c − P i−1,j c ||2 2 + ||P i,j c − P i,j−1 c ||2 2 , (13) where avg denotes the average operator...

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    Color Regularization Loss ( Lcolor-reg): This L1 regu- larization loss minimizes the predicted color change ∆C for each point to regularize the deformation network: Lcolor-reg = Σ||∆C||1. (14)

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    The weights assigned to each loss component are:λrgb = 1.0, λssim = 0.1, λdepth = 1.0, λtv = 0.1, λcolor-reg = 0.01, and λmotion = 1.0

    Motion Loss Lmotion: The motion loss is introduced in the main paper as, Lmotion = avgX ∈O|∆Xt − (TtX − X)|, (15) where X is the center position of a Gaussian in objectO. The weights assigned to each loss component are:λrgb = 1.0, λssim = 0.1, λdepth = 1.0, λtv = 0.1, λcolor-r...

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    This leads to inaccurate hu- man motion in some cases, which can be improved by incorporating human pose estimation as prior informa- tion (see Fig

    Limitation and Failure Cases • Our approach primarily focuses on modeling moving ve- hicles while using 4DGS [81] to model humans without explicit motion guidance. This leads to inaccurate hu- man motion in some cases, which can be improved by incorporating human pose estimati...

  115. [2024]

    IEEE/CVF Conference on Computer Vision and Pat- tern Recognition Workshop, 2025. 3

Pith tools

Reviewed August 11, 2026 · model on record in the stance chip above.